Standard response sprinklers with a temperature rating of 155F and an RTI of 100 (m-sec)1/2 are located under a 15 ft horizontal flat ceiling in a manufacturing facility. The sprinklers are spaced on a 12-ft by 10-ft pattern. Ambient temperature of the facility is approximately 70F. Diesel fuel spills from a ruptured hydraulic line and forms an unconfined pool with a diameter of approximately 7.5ft. If an ignition source comes in contact with the unconfined spill of hydraulic oil, what is the maximum time from ignition in which a sprinkler would operate